Sinus Tarsi Syndrome / Outside ankle pain
Sinus tarsi syndrome usually presents as pain over the lateral (outside) of the ankle, just in front of and below the lateral malleolus (ankle). Generally, the pain is worse when running or walking on sloping ground or uneven surfaces. Sinus tarsi syndrome pain is usually worse in the mornings and gets slightly better with activity.
Where is the sinus tarsi?
The sinus tarsi is a small tunnel formed out of the sulcus tali on the inferior (bottom) surface of the talus, and the sulcus calanei on the superior (top) surface of the calcaneus. In the tunnel there are nerves, fatty tissue and ligaments that are all prone to injury.